During an appearance on Monday's Ellen DeGeneres Show, Vergara admits that she got a little carried away during one of her fight scenes with Witherspoon. "I sent her to the emergency room," the 42-year-old Modern Family star admits. "Something with internal bleeding."

61PHOTOS

Sofia Vergara over the years

See Gallery

Sofia Vergara put Reese Witherspoon in the hospital with a 'popped ovary'!

Entertainer Sofia Vergara leaves the federal courthouse in the Brooklyn borough of New York Friday, Jan. 7, 2000, after lending her support for nightclub owner Chris Paciello, charged with the 1993 slaying of Judy Shemtov in her Staten Island home. (AP Photo/Mitch Jacobson)

Model Sofia Vergara poses outside The Lounge club May 2, 2002 in West Hollywood, CA. (Photo by David Klein/Getty Images)

Sofia Vergara (Photo by Jeff Kravitz/FilmMagic)

Sofia Vergara (Photo by Dimitrios Kambouris/WireImage)

Sofia Vergara (Photo by Rodrigo Varela/WireImage)

Sofia Vergara during World Premiere Of MGM's 'BulletProof Monk' at Grauman's Chinese Theatre in Hollywood, California, United States. (Photo by Gregg DeGuire/WireImage)

Actress Sofia Vergara poses for a photo as she arrives for the world premiere of "Soul Plane" Monday, May 17, 2004, in Los Angeles. (AP Photo/ Nam Y. Huh)

Actress Sofia Vergara arrives at the premiere of Paramount Picture's "Four Brothers", Tuesday, August 9, 2005 in New York. After their adoptive mother is murdered, the four brothers reunite to take the matter of her death into their own hands. (AP Photo/Stephen Chernin)

Colombian pop star Juanes, right, is joined by co-presenter Sofia Vergara to present the award for Best Female Pop Vocal Album at the 6th annual Latin Grammy Awards in Los Angeles on Thursday, Nov. 3, 2005. (AP Photo/Kevork Djansezian)

WEST HOLLYWOOD, CA - SEPTEMBER 16: Sofia Vergara arrives at the 63rd Primetime Emmy Awards Performers Nominee Reception at Spectra by Wolfgang Puck at the Pacific Design Center on September 16, 2011 in Los Angeles, California. (Photo by /Invision for the Academy of Television Arts & Sciences/AP Images)

LOS ANGELES, CA - SEPTEMBER 18: Sofia Vergara arrives at the Academy of Television Arts & Sciences 63rd Primetime Emmy Awards at Nokia Theatre L.A. Live on September 18, 2011 in Los Angeles, California. (Photo by Scott Kirkland/Invision for the Academy of Television Arts & Sciences/AP Images)

Actress Sofia Vergara arrives on the red carpet at the 20th Annual Screen Actors Guild Awards, on Saturday, Jan. 18, 2014 in Los Angeles. (Photo by John Shearer/Invision for PEOPLE Magazine/AP Images)

Eric Stonestreet, and from left, Sofia Vergara, Sarah Hyland, Jesse Tyler Ferguson, Ariel Winter, Aubrey Anderson-Emmons and the crew of "Modern Family" pose in the press room with the award for outstanding comedy series at the 66th Annual Primetime Emmy Awards at the Nokia Theatre L.A. Live on Monday, Aug. 25, 2014, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

Cast members, from left, Bobby Cannavale, Jon Favreau, Sofia Vergara, Oliver Platt and John Leguizamo attend the premiere for "Chef" during the 2014 Tribeca Film Festival on Tuesday, April 22, 2014, in New York. (Photo by Evan Agostini/Invision/AP)

After playing coy about the "secret" injury, Witherspoon elaborates, "I thought my appendix had burst."

Vergara further explains what went down during their on-screen altercation, and sort of implies it was her co-star's fault. "I push her and I push her and I kept telling her I think I'm pushing you too hard and she was like 'No, do it real,'" she recalls.

NEW YORK, NY - MAY 4: Reese Witherspoon at Good Morning America promoting her new film, 'Hot Pursuit' on May 4, 2015 in New York City. Credit: RW/MediaPunch/IPX

Reese Witherspoon seen at the New Line Cinema and Metro-Goldwyn-Mayer Premiere of "Hot Pursuit" on Thursday, April 30, 2015, in Los Angeles. (Photo by Eric Charbonneau/Invision for Warner Bros./AP Images)

Reese Witherspoon, left, and Sofia Vergara arrive at the LA Premiere Of "Hot Pursuit" held at the TCL Chinese Theatre on Thursday, April 30, 2015, in Los Angeles (Photo by Richard Shotwell/Invision/AP)

Reese Witherspoon, left, and Sofia Vergara, cast members in the upcoming film "Hot Pursuit," pose together before the Warner Bros. presentation at CinemaCon 2015 at Caesars Palace on Tuesday, April 21, 2015, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Sofia Vergara, left, and Reese Witherspoon arrive at the 50th annual Academy of Country Music Awards at AT&T Stadium on Sunday, April 19, 2015, in Arlington, Texas. (Photo by Jack Plunkett/Invision/AP)

Reese Witherspoon arrives at the Oscars on Sunday, Feb. 22, 2015, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)

TELLURIDE, CO - AUGUST 30: Actress Reese Witherspoon speaks at a seminar at Elks Park at the 2014 Telluride Film Festival - Day 2 on August 30, 2014 in Telluride, Colorado. (Photo by Vivien Killilea/Getty Images For Telluride Film Festival)

TELLURIDE, CO - AUGUST 30: Actress Reese Witherspoon attends the 2014 Telluride Film Festival - Day 2 on August 30, 2014 in Telluride, Colorado. (Photo by Vivien Killilea/Getty Images For Telluride Film Festival)

LOS ANGELES, CA - AUGUST 21: Reese Witherspoon is seen on August 21, 2014 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)

LOS ANGELES, CA - AUGUST 08: Reese Witherspoon is seen on August 08, 2014 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)

LOS ANGELES, CA - AUGUST 07: Reese Witherspoon is seen on August 07, 2014 in Los Angeles, California. (Photo by GONZALO/Bauer-Griffin/GC Images)

LOS ANGELES, CA - AUGUST 06: Reese Witherspoon is seen in Beverly Hills on August 06, 2014 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)

LOS ANGELES, CA - JULY 31: Reese Witherspoon is seen in Beverly Hills on July 31, 2014 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)

NEW YORK, NY - MAY 05: Reese Witherspoon attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by James Devaney/GC Images)

NEW YORK, NY - MAY 05: Reese Witherspoon, Stella McCartney and Kate Bosworth attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Neilson Barnard/Getty Images)

NEW YORK, NY - MAY 05: Reese Witherspoon, Stella McCartney and Kate Bosworth attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Neilson Barnard/Getty Images)

NEW YORK, NY - MAY 05: Actress Reese Witherspoon attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)